Structure of softball

Abstract

A softball includes a core, a separation layer, and a cover. The core is made of polyurethane that has high compression displacement. The separation layer is formed by wrapping, in a laminated manner, yarns around the core and soaking the wrapping yarns in adhesives. The cover is made of soft skin and includes a buffering layer formed on an inside surface thereof. When the durability of the softball is improved by increasing the compression displacement of the core, the buffering layer provided on the inside surface of the cover provides counterbalance of the overall compression displacement of the softball in order to meet the requirement of the softball specifications. The separation layer that is arranged between the core and the cover and is formed by wrapping the yarns in a laminated manner around the core, followed by soaking the yarns in adhesives so that the separation layer features waterproofness and resistance against humidity, by which invasion of water or humidity into the core, which leads to change of the compression displacement of the softball and eventually causes failure/damage of the softball, can be prevented. Thus, the durability and performance of the softball can be enhanced.

1 . A softball comprising a core, a separation layer, and a cover, the separation layer being arranged between the core and the cover, the separation layer being formed by wrapping, in a laminated manner, yarns around the core and soaking the wrapping yarns in adhesives, a buffering layer made of soft material and formed on an inside surface of the cover, whereby the core is allowed to make with high compression displacement.  
   
   
       2 . The softball as claimed in  claim 1 , wherein the core is made of polyurethane.  
   
   
       3 . The softball as claimed in  claim 1 , wherein the yarns are formed of polyester fibers.  
   
   
       4 . The softball as claimed in  claim 1 , wherein the separation layer and the core are tightly fixed together.  
   
   
       5 . The softball as claimed in  claim 1 , wherein the separation layer and the cover that is provided with the buffering layer are tightly fixed together.  
   
   
       6 . The softball as claimed in  claim 1 , wherein the buffering layer is made of a material selected from a group consisting of rubber, polyurethane, polyethylene, and ethylene vinyl acetate.